Cleanup RemotePlatformLayer when disconnecting RemoteFrame.

Source/core/rendering/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "core/rendering/compositing/CompositedLayerMapping.h"
 
 #include "core/HTMLNames.h"
 #include "core/fetch/ImageResource.h"
 #include "core/frame/FrameView.h"
+#include "core/frame/RemoteFrame.h"
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorNodeIds.h"
 #include "core/page/Chrome.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
@@ skipping 468 matching lines @@
         if (isDirectlyCompositedImage()) {
             updateImageContents();
         } else if (m_graphicsLayer->hasContentsLayer()) {
             m_graphicsLayer->setContentsToImage(0);
         }
     }
 
     if (WebLayer* layer = platformLayerForPlugin(renderer)) {
         m_graphicsLayer->setContentsToPlatformLayer(layer);
     } else if (renderer->node() && renderer->node()->isFrameOwnerElement() && toHTMLFrameOwnerElement(renderer->node())->contentFrame()) {
-        WebLayer* layer = toHTMLFrameOwnerElement(renderer->node())->contentFrame()->remotePlatformLayer();
-        if (layer)
+        if (toHTMLFrameOwnerElement(renderer->node())->contentFrame()->isRemoteFrame()) {
+            WebLayer* layer = toRemoteFrame(toHTMLFrameOwnerElement(renderer->node())->contentFrame())->remotePlatformLayer();
             m_graphicsLayer->setContentsToPlatformLayer(layer);
+        }
     } else if (renderer->isVideo()) {
         HTMLMediaElement* mediaElement = toHTMLMediaElement(renderer->node());
         m_graphicsLayer->setContentsToPlatformLayer(mediaElement->platformLayer());
     } else if (isAcceleratedCanvas(renderer)) {
         HTMLCanvasElement* canvas = toHTMLCanvasElement(renderer->node());
         if (CanvasRenderingContext* context = canvas->renderingContext())
             m_graphicsLayer->setContentsToPlatformLayer(context->platformLayer());
         layerConfigChanged = true;
     }
     if (renderer->isRenderPart())
@@ skipping 1800 matching lines @@
     } else if (graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
         name = "Scrolling Block Selection Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink